import {
  document,
	window,
	HTMLCanvasElement,
	requestAnimationFrame,
	cancelAnimationFrame,
core,
	Event,
  Event0
} from "dhtml-weixin"
import * as THREE from './three/Three';

import Stats from 'three/addons/libs/stats.module.js';
import { GUI } from 'three/addons/libs/lil-gui.module.min.js';

import { EffectComposer } from 'three/addons/postprocessing/EffectComposer.js';
import { RenderPass } from 'three/addons/postprocessing/RenderPass.js';
import { SAOPass } from 'three/addons/postprocessing/SAOPass.js';
import { OutputPass } from 'three/addons/postprocessing/OutputPass.js';

var requestId
Page({
  onShareAppMessage(){
    return getApp().onShare()
  },
  onShareTimeline(){
     return {title:"ThreeX 2.0"}
  },
	onUnload() {
		cancelAnimationFrame(requestId, this.canvas)
		this.worker && this.worker.terminate()
if(this.canvas) this.canvas = null
		setTimeout(() => {
			if (this.renderer instanceof THREE.WebGLRenderer) {
				this.renderer.dispose()
				this.renderer.forceContextLoss()
				this.renderer.context = null
				this.renderer.domElement = null
				this.renderer = null
			}
		}, 0)
	},
  webgl_touch(e){
		const web_e = (window.platform=="devtools"?Event:Event0).fix(e)
		this.canvas.dispatchEvent(web_e)
  },
  onLoad() {
		document.createElementAsync("canvas", "webgl2").then(canvas => {
      this.canvas = canvas
      this.body_load(canvas).then()
    })
  },
  async body_load(canvas3d) {	
  let container, stats;
  let camera, scene, renderer;
  let composer, renderPass, saoPass;
  let group;

  init();
  animate();

  function init() {

    container = document.createElement( 'div' );
    document.body.appendChild( container );

    const width = window.innerWidth;
    const height = window.innerHeight;

    renderer = new THREE.WebGLRenderer( { antialias: true } );
    renderer.setPixelRatio( window.devicePixelRatio );
    renderer.setSize( width, height );
    document.body.appendChild( renderer.domElement );

    camera = new THREE.PerspectiveCamera( 65, width / height, 3, 10 );
    camera.position.z = 7;

    scene = new THREE.Scene();

    group = new THREE.Object3D();
    scene.add( group );

    const light = new THREE.PointLight( 0xefffef, 500 );
    light.position.z = 10;
    light.position.y = - 10;
    light.position.x = - 10;
    scene.add( light );

    const light2 = new THREE.PointLight( 0xffefef, 500 );
    light2.position.z = 10;
    light2.position.x = - 10;
    light2.position.y = 10;
    scene.add( light2 );

    const light3 = new THREE.PointLight( 0xefefff, 500 );
    light3.position.z = 10;
    light3.position.x = 10;
    light3.position.y = - 10;
    scene.add( light3 );

    const light4 = new THREE.AmbientLight( 0xffffff, 0.2 );
    scene.add( light4 );

    const geometry = new THREE.SphereGeometry( 3, 48, 24 );

    for ( let i = 0; i < 120; i ++ ) {

      const material = new THREE.MeshStandardMaterial();
      material.roughness = 0.5 * Math.random() + 0.25;
      material.metalness = 0;
      material.color.setHSL( Math.random(), 1.0, 0.3 );

      const mesh = new THREE.Mesh( geometry, material );
      mesh.position.x = Math.random() * 4 - 2;
      mesh.position.y = Math.random() * 4 - 2;
      mesh.position.z = Math.random() * 4 - 2;
      mesh.rotation.x = Math.random();
      mesh.rotation.y = Math.random();
      mesh.rotation.z = Math.random();

      mesh.scale.x = mesh.scale.y = mesh.scale.z = Math.random() * 0.2 + 0.05;
      group.add( mesh );

    }

    stats = new Stats();
    container.appendChild( stats.dom );

    composer = new EffectComposer( renderer );
    renderPass = new RenderPass( scene, camera );
    composer.addPass( renderPass );
    saoPass = new SAOPass( scene, camera );
    composer.addPass( saoPass );
    const outputPass = new OutputPass();
    composer.addPass( outputPass );

    // Init gui
    const gui = new GUI();
    gui.add( saoPass.params, 'output', {
      'Default': SAOPass.OUTPUT.Default,
      'SAO Only': SAOPass.OUTPUT.SAO,
      'Normal': SAOPass.OUTPUT.Normal
    } ).onChange( function ( value ) {

      saoPass.params.output = value;

    } );
    gui.add( saoPass.params, 'saoBias', - 1, 1 );
    gui.add( saoPass.params, 'saoIntensity', 0, 1 );
    gui.add( saoPass.params, 'saoScale', 0, 10 );
    gui.add( saoPass.params, 'saoKernelRadius', 1, 100 );
    gui.add( saoPass.params, 'saoMinResolution', 0, 1 );
    gui.add( saoPass.params, 'saoBlur' );
    gui.add( saoPass.params, 'saoBlurRadius', 0, 200 );
    gui.add( saoPass.params, 'saoBlurStdDev', 0.5, 150 );
    gui.add( saoPass.params, 'saoBlurDepthCutoff', 0.0, 0.1 );
    gui.add( saoPass, 'enabled' );

    window.addEventListener( 'resize', onWindowResize );

  }

  function onWindowResize() {

    const width = window.innerWidth || 1;
    const height = window.innerHeight || 1;

    camera.aspect = width / height;
    camera.updateProjectionMatrix();
    renderer.setSize( width, height );

    composer.setSize( width, height );


  }

  function animate() {

    requestId = requestAnimationFrame( animate );

    stats.begin();
    render();
    stats.end();

  }

  function render() {

    const timer = performance.now();
    group.rotation.x = timer * 0.0002;
    group.rotation.y = timer * 0.0001;

    composer.render();

  }
  }
})